Class IX

Respiration carried out in absence of oxygen is
  1. aerobic respiration
  2. anaerobic respiration
  3. cellular respiration
  4. fermentation
Carbon dioxide (CO2) concentration is measured in blood through
  1. biosensors
  2. receptors in lungs
  3. receptors in esophagus
  4. receptors in blood vessels in neck
Types of gametes produced by 2 pair of chromosomes can be
  1. 4
  2. 6
  3. 8
  4. 10
Type of energy produced during movement is called
  1. catalytic energy
  2. physical energy
  3. chemical energy
  4. kinetic energy
Most fertile layer of soil is
  1. top layer
  2. organic layer
  3. middle soil layer
  4. middle soil layer
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